The Welsh Harp ~ Brent Reservoir is the perfect place where going for a short break after work or if you are fancy of long walk or run surrounded by nature. There are few paths which you can follow and the full tour around the lake is about 8 km. It can be quite challenge in some spot, expecially on south east area of the lake, where stuff are starting to falling apart.Still, it is a lovely park, one of the most natural and rural in London city.