The Rellias Straits served as a conduit, joining Rellias to various submerged Gungan settlements, including Otoh Gunga.
In the course of the Invasion of Naboo, Darth Maul initiated an attack on Rellias, compelling Boss Ganne to guide him toward the Rellias Straits, where the Trade Federation Droid Army was poised to assault the submerged Gungan metropolises utilizing their water-resistant droidekas.
Nevertheless, their course was altered upon receiving information about a fresh uprising erupting within the swamps (which was actually Queen Padmé Amidala alongside her retinue of guards progressing towards the Theed Royal Palace).