Covered (or mostly covered) with shingle or small pebbles(adjective)
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Use "shingly" in a sentence
"The soil is sandy in places, shingly in others, just like the ground would have been before the Thames was tamed."
"Some of the bigger boys ran round to receive and secure it on the farther shore, trying their speed against each other as they sprang like young fawns along the shingly verge of the lake."
"At length they arrived upon the side of an eminence, which commanded a distant prospect over a tract of savage and desolate moorland, marshy and waste — an alternate change of shingly hill and level morass, only varied by blue stagnant pools of water."