Inner Part of the Gulf of Nicoya: Area comprised between the imaginary straight line that extends from the westernmost point of the city of Puntarenas (9°57´59",43 north latitude and 84°51´01",31 west longitude), to the easternmost point of Punta Gigante on the Nicoya Peninsula (9°54´12",52 north latitude and 84°54´53",37 west longitude) and from this line, inshore skirting the coast on both sides of the gulf, until reaching the imaginary straight line that extends between Puerto Níspero (10°12´40",7 north latitude and 85°14´01",58 west longitude) and Puerto Moreno (10°12´15",8 north latitude and 85°14´42",45 west longitude) at the mouth of the Tempisque River.
Outer Part of the Gulf of Nicoya: Area comprised between the imaginary straight line that extends from the westernmost point of the city of Puntarenas (9°57´59",43 north latitude and 84°51´01",31 west longitude), to the easternmost point of Punta Gigante on the Nicoya Peninsula (9°54´12",52 north latitude and 84°54´53",37 west longitude) and from this line, offshore skirting the coast on both sides of the gulf, until reaching the imaginary straight line that extends between Cabo Blanco (9°33´08",06 north latitude and 85°06´23",15 west longitude) and Punta Herradura (9°39´02",29 north latitude and 84°40´50",58 west longitude).