In geography, a pole of inaccessibility is the farthest and most difficult to access location in a given landmass, sea, or topographical feature, category, or criterion, relative to a given origin point. A geographical criterion of inaccessibility marks a location that is the most challenging to reach according to that criterion. Often it refers to the most distant point from the coastline, implying the farthest point into a landmass from touching the shore, or the farthest point into the ocean from any landmass. In these cases, a pole of inaccessibility can be defined as the center of the largest circle that can be drawn within an area of interest without encountering a coast. Where a coast is imprecisely defined, the pole will be similarly imprecise.
Northern pole of inaccessibility
The old Soviet Pole of Inaccessibility Station, revisited by Team N2i on 19 January 2007
The North-West portion of the North American Pole of Inaccessibility.
Australian Pole of Inaccessibility
The ocean is the body of salt water that covers approx. 70.8% of Earth. In English, the term ocean also refers to any of the large bodies of water into which the world ocean is conventionally divided. Distinct names are used to identify five different areas of the ocean: Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic. The ocean contains 97% of Earth's water and is the primary component of Earth's hydrosphere, thus the ocean is essential to life on Earth. The ocean influences climate and weather patterns, the carbon cycle, and the water cycle by acting as a huge heat reservoir.
Pacific Ocean side, Apollo 11, July 1969
Praia da Marinha in Algarve, Portugal
The ocean is a major driver of Earth's water cycle.
High tide and low tide in the Bay of Fundy, Canada.