No, Loch Lomond is a freshwater loch, not a sea loch. Located in the heart of the Loch Lomond & The Trossachs National Park in Scotland, it is the largest body of freshwater by surface area in Great Britain. While many Scottish lochs (like Loch Fyne or Loch Long) are "sea lochs"—meaning they are saltwater inlets or fjords connected directly to the ocean—Loch Lomond was formed by glacial activity that left it isolated from the sea. Its waters are fed primarily by the River Falloch and the River Endrick. The loch is famous for the Highland Boundary Fault, a geological line that runs right through it, physically separating the rugged Highlands in the north from the rolling Lowlands in the south. Because it is freshwater, it supports a different ecosystem than the tidal sea lochs nearby, including various species of freshwater fish and the unique "wallaby colony" on Inchconnachan Island, making it a premier destination for inland boating and hiking.