Unit Definition (alen [Scandinavia])
The Alen is a traditional Scandinavian unit of distance, which is very similar to the North German Elle: which is roughly equal to 2 feet or 60 centimeters.

Unit Definition (block [East U.S.])
The Block is an informal unit of distance popular in the U.S. A block is the average distance between street intersections in the rectangular street grids common in most American cities. The length of a block in Eastern USA is about 1/20 mile or 80 meters.