Having been to it is bonus points. Outside of the super obvious ones, the Great Basin like in Central Nevada is incredibly empty. There are many places that could be mentioned beside this. Will love to hear.
“So I went to this spot over 1,600 miles away from any land in the Southern Ocean. I get there and look around, and I says, ‘by golly, it’s all water!’”
Most remote place is the furthest galaxy discovered, I believe be MoM-z14 or similar, like 20 billion light years away. Probably not the answer you're looking for but the technical answer to the question I guess.