Physics Wallah is an Indian edtech platform that provides accessible & comprehensive learning experiences to students from Class 6th to postgraduate level. We also provide extensive NCERT solutions, sample paper, NEET, JEE Mains, BITSAT previous year papers & more such resources to students. Physics Wallah also caters to over 3.5 million registered students and over 78 lakh+ Youtube subscribers with 4.8 rating on its app.
We Stand Out because
We provide students with intensive courses with India’s qualified & experienced faculties & mentors. PW strives to make the learning experience comprehensive and accessible for students of all sections of society. We believe in empowering every single student who couldn't dream of a good career in engineering and medical field earlier.
Our Key Focus Areas
Physics Wallah's main focus is to make the learning experience as economical as possible for all students. With our affordable courses like Lakshya, Udaan and Arjuna and many others, we have been able to provide a platform for lakhs of aspirants. From providing Chemistry, Maths, Physics formula to giving e-books of eminent authors like RD Sharma, RS Aggarwal and Lakhmir Singh, PW focuses on every single student's need for preparation.
What Makes Us Different
Physics Wallah strives to develop a comprehensive pedagogical structure for students, where they get a state-of-the-art learning experience with study material and resources. Apart from catering students preparing for JEE Mains and NEET, PW also provides study material for each state board like Uttar Pradesh, Bihar, and others
World Hydrography Day is an annual event on June 21 that promotes awareness of hydrography's role in safe navigation, marine conservation, and sustainable ocean use.
What is the theme for World Hydrography Day 2025?
The theme for World Hydrography Day 2025 is “Seabed Mapping: Enabling Ocean Action”.
Who started World Hydrography Day?
It was established by the International Hydrographic Organization (IHO) in 2006.
Why is hydrography important for India?
India has a vast coastline, and hydrography helps ensure safe navigation, coastal development, and national security.
Which organisation handles hydrography in India?
The National Hydrographic Office (NHO) under the Indian Navy manages hydrographic services in India.
World Hydrography Day 2025 Theme, Celebration and History
World Hydrography Day 2025 is celebrated on June 21, 2025. The World Hydrography Day 2025 theme is “Seabed Mapping: Enabling Ocean Action”.
Deeksha Dixit21 Jun, 2025
Share
World Hydrography Day 2025 will be observed on Saturday, 21st June 2025. It aims to raise awareness about hydrography and its contributions to marine navigation, coastal development, disaster management, and environmental protection. In 2025, World Hydrography Day will reflect on how hydrography supports the Blue Economy, sustainable ocean use, and scientific discovery. Keep reading to learn more!
World Hydrography Day 2025
World Hydrography Day is observed annually on June 21 to celebrate the crucial role of hydrography, the science of measuring and describing the physical features of oceans, seas, coastal areas, lakes, and rivers. Established by the International Hydrographic Organization (IHO), this day encourages countries to promote better use of hydrographic data.
Here is an overview of World Hydrography Day 2025:
World Hydrography Day 2025 Overview
Date
Saturday, 21 June 2025
Officially recognized
By the UN in 2005
First Observed
2006
Theme 2025
"Seabed Mapping: Enabling Ocean Action"
Objective
To raise awareness about hydrography and its importance for ocean knowledge, navigation, and sustainability
Organizing Body
International Hydrographic Organisation (IHO)
Related Events
Aligns with the United Nations Ocean Conference 2025 and the IHO Strategic Plan
Activities
IHO uses social media platforms and encourages member states to share materials and events using hashtags #WorldHydrographyDay and #WHD
World Hydrography Day 2025 Theme
The theme for World Hydrography Day 2025 is "Seabed Mapping: Enabling Ocean Action." It highlights how mapping the ocean floor supports safe navigation, marine resource management, and sustainable development. World Hydrography Day 2025 theme aligns with the IHO’s Strategic Plan Goals, especially Goal 3, which promotes global cooperation on ocean knowledge, and Goal 2, which encourages wider use of hydrographic data for public benefit.
History of World Hydrography Day
World Hydrography Day was first celebrated in 2006. It was officially recognised by the United Nations General Assembly (UNGA) in 2005 by Resolution A/RES/60/30 to highlight the importance of hydrography. However, the roots go back to 1921, when the International Hydrographic Bureau (now the IHO) was formed in Monaco.
The IHO has worked for over a century to standardise hydrographic practices and promote safety at sea. After official recognition in 2006, World Hydrography Day has been celebrated every year on 21st June, the date marking the founding of the IHO. This day allows hydrographic offices and institutions around the world to showcase their work, educate the public, and inspire future marine scientists.
What is Hydrography?
Hydrography is the science of measuring and describing physical features of oceans, seas, coastal areas, lakes, and rivers. It includes mapping the seafloor, measuring water depths, and identifying hazards for navigation.
Hydrographers use modern tools like sonar, echo sounders, and satellite technology to gather underwater data. This information is then used to produce nautical charts, guide shipping, and plan coastal development. Hydrography also plays an important role in:
Climate change studies
Marine biodiversity research
Tsunami warning systems
Submarine cable laying
In short, hydrography helps us understand and manage our waters safely and sustainably.
Importance of Hydrography
Hydrography matters more than most people realise. Its data is crucial for:
Safe Navigation: Accurate sea charts prevent ship accidents and support international trade.
Environmental Protection: It helps identify coral reefs, fragile ecosystems, and areas vulnerable to pollution.
Defence and Security: Navies rely on hydrographic maps for submarine operations and coastal surveillance.
Disaster Risk Reduction: Hydrography helps model floods, tsunamis, and coastal erosion to save lives.
Marine Development: Ports, offshore wind farms, and underwater pipelines need hydrographic data to be built safely.
For coastal nations like India, hydrography is essential for protecting marine boundaries, managing fisheries, and supporting the shipping industry.
International Hydrographic Organization (IHO)
The International Hydrographic Organization (IHO) is a global authority that sets standards for hydrography. Established in 1921 and headquartered in Monaco, the IHO currently includes 102 member states. Its main goals are to coordinate hydrographic surveys worldwide, promote the use of consistent nautical charts and services, facilitate the exchange of technical knowledge, and support capacity-building efforts.
India is an active member of the IHO and is home to one of the oldest hydrographic offices in the world, the National Hydrographic Office (NHO), located in Dehradun. To further its mission, the IHO also conducts workshops, offers training, and publishes guidelines to help countries enhance their hydrographic capabilities.
World Hydrography Day 2025 Activities
World Hydrography Day 2025 will be celebrated with events highlighting the importance of seabed mapping in ocean protection and sustainable development:
West African Hydrographic Summit (June 19–21, Abuja, Nigeria): This event will feature keynote talks, panel discussions, product launches, exhibitions, and networking among maritime professionals.
South African Navy Events (June 20–21, East London): Activities include a hydrography lecture, book launch, ship tours, tech demos, and a parade, highlighting naval contributions to ocean mapping.
Global Outreach: IHO will promote the day online through social media and a dedicated webpage. Countries and organizations will share content using hashtags #WorldHydrographyDay and #WHD.
Community Engagement: In India, the Indian Navy’s Hydrographic Department often organises coastal clean-ups, ship visits, and community engagement activities to educate the public.
In essence, World Hydrography Day 2025 is a reminder of how much we depend on the oceans and on the experts who help us understand them. By supporting hydrography, we ensure safer seas, stronger economies, and a healthier planet.
