The lush and overgrown Arolammi, created by the expansion of the Vantaanjoki, is a wetland surrounded by fields. The area is an important nesting and feeding place for water and shorebirds. The vegetation on the shores of Arolammi has changed quite a lot since the foundation dam was built on February 8.2.2003, 84,5. The dam has leveled the water level to a level of 85–XNUMX meters. Apparently, the water level rising and staying at a higher level permanently has caused more willows and coastal birches to remain under water and to remove them from the beaches. Especially at the northwestern end of Arolammi, there are almost no trees or willows.
At the bottom of Arolammi there are springs that improve the water quality. At the springs, the water remains thawed even in winter, except for the coldest weeks.
There are willow salmon on the south and north shores of the pond. The pond itself is bordered by a luxuriant saraikkoranta lichen zone, where, among other things, red sedge, water mistletoe, reed sedge, honeysuckle, cape sedge, sedge sedge, and sedge sedge grow. On the banks of the Vantaanjoki, in the western part of the area, there are handsome aspens and stripes and gray alder. Wetness interferes with movement on the beach.
The beach is surrounded by different vegetation zones. In the outermost zone there is a growing zone of sorghum, beach flower, oleander, water mistletoe and reed sedge, and in some places nettles and sedges grow in abundance. Beyond that, there is a zone of lake reeds in the water, and in the open water, there is a lake reed zone. The pond's aquatic plants have been mowed for six years.