The relief of Tbilisi is complex. The part of the city which lies on the left bank of the Mt'k'vari River extends for more than  from the Avchala District to River Lochini. The part of the city which lies on the right side of the Mt'k'vari River, on the other hand, is built along the foothills of the Trialeti Range, the slopes of which in many cases descend all the way to the edges of the river Mt'k'vari. The mountains, therefore, are a significant barrier to urban development on the right bank of the Mt'k'vari River. This type of a geographic environment creates pockets of very densely developed areas while other parts of the city are left undeveloped due to the complex topographic relief.