21. These long low earth mounds were constructed to allow the animals to burrow in what were otherwise thin soils. 22. The island is now composed of two artificial earth mounds , terraced with retaining walls, roads and newly planted vegetation. 23. It was also fortified by ditches and earth mounds , palisades, watch towers and natural features like lakes and swamps. 24. Accompanied by two tanks and a bulldozer, they set up a checkpoint and began erecting earth mounds and fortifications. 25. The buildings on the west, on the other hand, are open earth mounds lined in stone for public displays. 26. The powder magazines have deteriorated, owing to collapse of the earth mounds following decay of their wooden interior shoring. 27. He has also translated Gert Jonke's " The System of Vienna : From Heaven Street to Earth Mound Square ". 28. As part of the work, an earth mound , or motte, high, was piled up around the base of the tower. 29. The tomb of Zhang Yanghao consists of an earth mound that is 1.9 meter tall and surrounded by masonry walls. 30. Opposite the church is a field containing earth mounds from the original village boundary, which are unique in the country.