Never heared of Amsterdam lake, Google does not know it also. Do you mean the "ijselmeer"? that's the biggest body of fresh water next to Amsterdam.
Irish Sea
The Pacific Ocean and the Sea of Japan.
The Atlantic Ocean
The Amstel.
Around Ethiopia are the Red Sea, the Indian Ocean and the Gulf of Eden
No, the center of gravity of a solid body may not always lie within the body. It depends on the distribution of mass within the body. If the mass is distributed symmetrically, then the center of gravity will be located within the body. However, if the mass distribution is asymmetrical, the center of gravity may lie outside of the body.
The red sea
no
Simple answer, yes.
Yes
Amsterdam takes its name from the dam on the Amstelriver.