Which snake is famous for reaching the fastest recorded land speed?

The black mamba is famous for reaching the fastest recorded land speed attributed to a snake.

Reports commonly give the black mamba a top speed of about 16 to 20 kilometres per hour over short distances. It is native to parts of sub-Saharan Africa and is a highly agile, primarily terrestrial snake. Its name comes from the dark colouring inside its mouth, not from the usual colour of its skin.

Black mambas are long, slender elapids and may exceed 4 metres, making them among Africa’s longest snakes. They often retreat from danger, but can display an open mouth and raise the front of the body when seriously threatened.

The speed claim is often repeated as a precise world record, although measuring a fleeing wild snake is difficult. The reliable point is that the black mamba is widely regarded as the fastest snake on land, rather than that every individual reaches the same exact speed.