Final answer:
The Republic of Ireland is bordered by the Irish Sea to the east and the Celtic Sea to the south.
Step-by-step explanation:
The country bordered by the Irish Sea to the east and the Celtic Sea to the south is the Republic of Ireland. The Republic of Ireland shares the island of Ireland with Northern Ireland, which is part of the United Kingdom. The Republic of Ireland boasts a lush green landscape due to its type C climate, earning it the nickname "The Emerald Isle," although it has relatively few natural resources apart from its scenic beauty and agricultural potential.