Bobsled is a winter sport, also known as bobsleigh (the official name used in the Winter Olympic Games), in which teams make timed runs down narrow, twisting, banked purpose-built tracks in a gravity-powered, steerable sled.
... and navigability of this strait. The Russians made their first permanent settlement on Sakhalin in 1857 as a Czarist penal colony; but the southern part of the island was ...