Final answer:
El Salvador is the country with the Pacific Ocean to the southwest, separated from Nicaragua by the Gulf of Fonseca, and has Jiquilisco Bay extending inland from the Pacific.
Step-by-step explanation:
The country with the Pacific Ocean to the southwest and separated from Nicaragua by the Gulf of Fonseca is El Salvador. El Salvador also features the Jiquilisco Bay, which extends inland from the Pacific. It is bordered by Guatemala to the northwest and Honduras to the north and northeast. El Salvador's capital is San Salvador. The Gulf of Fonseca, which El Salvador shares with Honduras and Nicaragua, provides a natural boundary between these countries.