Suncoast High is a fictional school used in Mako Mermaids. The school's superviser is a mermaid, Rita Santos who is also the fake aunt of Lyla, Sirena and Nixie who are mermaids themselves, but don't attend the school.
The school's halls are located outside. The school has a beautiful campus, including a fountain. Although this is debatable, the school appears to be small because Rita knew that the three girls were not students there when they snuck in.