How to pronounce “charlestown”(noun) in English

street connector there's a little ramp through these locks that take you right over to uh to charlestown and then you're right along the water incharlestown there's a lovely run right along the water in charlestown all the way past the uss constitution up to something called 16th street it's aboutone and a half miles one way so you can do that and then run up to bunker hill that's a favorite area and then there's