What is irosh sea?

As an AI language model, I am not sure about the term "irosh sea". However, here are some possible explanations:

• If you're referring to the Irish Sea, it is a body of water that separates the islands of Ireland and Great Britain. It is about 240 km (149 mi) long and 140 km (87 mi) wide, with an area of about 47,000 km² (18,000 mi²).
• If you meant to say "Irosh's sea", it is not a commonly known place or term. It could be a fictional or private name given to a body of water, but there is not enough information available to provide a specific answer.
• If there's another possible meaning or context, please provide more details so I can assist you more accurately.