Jamieson, Fausset and Brown on Ezekiel 32:6

6. land wherein thou swimmest--Egypt: the land watered by the Nile, the the source of its fertility, wherein thou swimmest (carrying on the image of the crocodile, that is, wherein thou dost exercise thy wanton power at will). Irony. The land shall still afford seas to swim in, but they shall be seas of blood. Alluding to the plague (Ex 7:19; Re 8:8). Havernick translates, "I will water the land with what flows from thee, even thy blood, reaching to the mountains": "with thy blood overflowing even to the mountains." Perhaps this is better.