An outdoor thermal pool in Sapareva Banya, Bulgaria, is captured at twilight under a cloudy, blue-gray sky

An outdoor thermal pool in Sapareva Banya, Bulgaria, is captured at twilight under a cloudy, blue-gray sky. The lower half of the frame shows the light blue, agitated water of the unoccupied pool, with an integrated, tiled edge composed of blue and white mosaic on the left. Water jets or currents cause noticeable ripples and frothing on the surface, particularly on the right side. The elevated pool deck, positioned in the midground, is furnished with multiple white plastic lounge chairs and small white tables, arranged in rows facing outward. Three large, conical, folded white sun umbrellas are interspersed among the seating arrangements. A black metal railing separates the pool area from a panoramic view of distant, undulating mountains or hills under the dim sky. To the left, a dense, tall pine forest rises steeply, its dark trees forming a prominent silhouette against the horizon. No individuals are present within the scene. A subtle artificial light source is visible beneath the water surface on the far left edge of the pool.