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There are numerous parks in Bucharest which are of course paradise for joggers and runners. You can find more information and useful descriptions on the official city website, under Culture/Leisure -> Parks and Gardens
. Searching for bucharest jogging
on google reveals that the web is scattered with jogging trail maps for Bucharest. Some, if not most, of which are enclosed in one of the many parks in the city. Here is a list of numerous trails on Map My Run. Picking one at random yields this trail in the Herastrau Park, the largest in Bucharest. You can of course pick a park at random and design your own route.