Tornado Alley is mostly plains. There are some hills though and the occasional river or lake.
By the Lake was created in 1969.
Kentucky Lake was created in 1944.
Lake Opuha was created in 1998.
Lake Phelps was created in 1929.
Lake Beshear was created in 1962.
Lake Malone was created in 1961.
Balsamand Lake was created in 1159.
The Lake of Tears was created in 2000.
The Lake of Souls was created in 2005.
Plovers Lake was created in 1999.
Lake of Tears was created in 1994.