Moneron has an area of about 30 square kilometres (12 sq. mi) and a highest point of 429 meters (1,407 ft). It is approximately 7.2 km (4.5 mi) long (N/S axis) by 5.5 km (3.4 mi) wide, and is located 41 nautical miles (76 km) from Sakhalin's port of Nevelsk and about 30 nautical miles (56 km)[1] directly southwest of Sakhalin Island itself at the northeastern end of the Sea of Japan. It is the only landmass in the whole Tatar Straits. It has no permanent population.