4 KudoZ points awarded for this answer. Comment: "Revised sentence: The yellow regions on the map are high mountains, and the blue regions are sea and ocean. Let me show you. Discussion: That I may refer you to: http://homepage.mac.com/moogoonghwa/tsongkit/part2/II-6b-g.html#s18 Acknowledgement: Thank you everyone for the interesting discussion. As I am not familiar with the etymology of the character 海, I decided to play it safe and include both meanings. Would "sea" not be correct for a small map showing only the water adjacent to a particular land mass, and "ocean" correct for a larger map showing entire continents. The idea of 吧 indicating "voluntary intent" on the part of the speaker appears to be shared among the respondents. Please see the URL above for my discussion of the phrase 我指給你看. I hope you approve. In answer to Daniel Xie's question. In English the preposition "on" is usually preferred in reference to things found on top of flat surfaces. Objects on that surface that are enclosed in boxes, circles, and the like can be said to be located "in", however. This was a difficult question to grade, because everyone had something additional to offer. I declined NKWong's entry because of his incorrect use of the preposition "it". Wherestip gave a much better suggestion, but failed to provide the discussion of either NKWong or Daniel Xie."