https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/roadways/minnesota-state-highway-95/northbound/northbound-on-highway-95.md
When Ur was founded, the Persian Gulf’s water level was two-and-a-half metres higher than today. Ur is thought, therefore, to have had marshy surroundings; irrigation would have been unnecessary, and the city’s evident canals likely were used for transportation.