The best replacement for black sea is lake superior.

The best alternatives to black sea are rated as following:
★★★★★  lake superior
★★★★  great lakes
★★★  dead sea
★★★  lake michigan
★  caspian sea

Your alternative for black sea is not listed? Suggest!
Speaking about black sea, one probably shouldn't forget about mediterranean sea.

Other search terms related to black sea and their ratings are:
★★★★★ mediterranean sea
★★★★ constantinople
You have in mind a companion for black sea and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of black sea in all years. Click on graph for more.
black sea
lake superior
great lakes