text: how large is the giant rectangular tank at marineland's aquarium in florida? how large is the giant rectangular tank at marineland's aquarium in florida?  list your resources!!!!!!! 72,000 cubic feet.  "the scale and size of marineland’s tanks was an engineering feat that had never been accomplished before. the round tank, which is 75 feet in diameter and 11 feet deep, and the rectangular tank, which measures 100 feet long, 40 feet wide and 18 feet deep, are surrounded by 200 portholes of glass for viewing and filming."  hope this helps!