On the high seas typically refers to being out in the open waters of the ocean, away from shore. However, there are a few other phrases and expressions that can be used to convey a similar meaning. "Out at sea" is a common one and denotes being away from land and civilization. "Navigating the open waters" or "cruising the deep blue" can also be used to describe being out in the sea. "Adrift at sea" refers to being lost or stranded without direction or purpose. Lastly, "sailing across the ocean" conveys a sense of adventure and discovery, evoking images of explorers forging ahead on uncharted waters.