Hydrography Data

Shows an enclosed channel for carrying a watercourse (for example: a stream, a sewer, or a drain) under a route (for example: a road, a railway, or an embankment). Usually the construction of the route is unaffected.

Show a mass of rock or coral which either reaches close to the sea surface or is exposed at low tide, posing a hazard to navigation.

Show a land mass, other than a continent, surrounded by water.

Shows a barrier constructed to hold back water and raise its level to form a reservoir or to prevent flooding.

Shows a barrier constructed to hold back water and raise its level to form a reservoir or to prevent flooding.

Shows a structure that protects a waterbody region (for example: a shore, a harbour, and/or an anchorage) from water waves by preventing them from reaching the protected region or reducing their magnitude.

Show the location at which a watercourse disappears into the terrain.

Show a vertically decending part of a watercourse where it falls from a height (for example: over a rock or a precipice).

Shows a shallow place in a body of water used as a crossing.

Show an isolated rocky formation or a single large stone or coral, usually one constituting a danger to navigation.