The Trident and the Pearl by Sarah K.L. Wilson

In this captivating romantasy debut by Sarah K. L. Wilson, a desperate Queen Coralys, ruler of the Kingdom of the Five Isles, faces a catastrophic disaster that claims her husband and half her nation. She turns to the gods for help, who save her land but demand a peculiar exchange: she must marry the first man to step onto her pier. Expecting a prince, she's met instead by a humble, unkempt fisherman. Undeterred, she marries him and sets sail, unaware that this fisherman is actually the god of the sea, seeking her help to turn the tides against him and save his own kingdom.