To the north Kotel municipality borders with Omurtag municipality, to the northwest - Antonovo municipality, to the west - to Sliven municipality, to the south - to Straldzha municipality, to the east - to Sungurlare municipality and to the northeast - to Varbitsa municipality. In the morpho-geographic aspect, the relief of the region has a hilly-foothill and mountain-valley-shaped relief with an average altitude of 300 to 1128 m. The highest peak is Razboina, 1128 m high, which connects to the southwest with the foothills of the Icherian and Karandil hills. The geographical area "Chukata" is a connecting mountain strip - Sliven mountain with Icherensko-Zherunski heights and Kotel hills. Climbing the mountain elevation of the Kotel locality "Chukari", leading to Razboina peak, in the south-eastern direction, forest and tourist eco paths are opened to the villages of Zheravna, Neykovo and then to the Karandila area in the Sliven mountain.
The climate is moderate continental, with an impact on the mountain climate - snowy winter, cool summer and warm and prolonged autumn. Air is pure and beneficial for the treatment of pulmonary and bone-joint diseases. In hydrographic terms, the region is rich in mountain springs and small rivers mainly with rainy-winter nourishment. On the territory of the town and the region, from the mountain peak (connecting the Kotel with the Ticha-Omurtag region) "Suhi Dyal", two major rivers flowing through the city spring: Suhoika and Glogova. In the village of Gradets, they flow into the Gola Kamchia River, which is one of the Luda Kamchia River's sleeves, flowing into the Kamchia Dam. The average rainfall is 799 mm per square meter with a minimum in the summer.
In the beautiful park called "Springs", the trees rise majestically and tell the legend of the appearance of the three springs whose waters were rolling like a cauldron:"Three girls came out of Kotleshnitsa's wild waters. Tall as poplars. One - black as a mature cherry and with lips like leeches. Her hair - like a mare's ruff, they swing to the left or right. The other - white, with silver hair. Seeing it once, as if he were seeing a spirit, as transparent and beautiful as a echoing song. The third - like pure melted gold. And her hair, her eyes and her feet. Leaving sunlight everywhere she steps. Russa, Rada, Jovka. The daughters of that tireless blacksmith who, in one of the caves, forged on his anvil, to arm small and big for the battle with the terrible dragon who took every year the most beautiful girl. There was a time when they voluntarily gave girls to it, it was pointless to resist. But when the three pretty maidens came, people were ready for the battle. Early in the morning, the fiery crest of the dragon poured a melted resin around the cave. They waved forged swords, the blacksmith fought with them but in vain. The dragon grabbed the girls, light as feathers, and carried them, and the men followed. The three girls were crying, and where the dragon passed their tears flowed like streams. By these streams of clear and pure tears, people ran after the dragon and waved their swords, but they could not defeat the dragon. He put the maidens on the ground and something crackled beneath them. They disappeared suddenly. Holes appeared and springs out of them sprang up. "