1) Impact crater on Mars 
[crater] Porth is a crater on the planet Mars. It is named after the town of Porth, Rhondda Cynon Taff, south Wales, United Kingdom. It is located at 21.4°N, 255.9°W and has a diameter of 9.3 km. ...[crater on Mars] People, flora, fauna, places, and events associated with the White Sea, an inlet of the Barents Sea within the Arctic Ocean. ...