The present invention relates to a boundary block for a coastal planting located between a coast and a planting portion. The top of the boundary block is exposed to the ground, and the bottom is buried in the underground. Accordingly, the boundary block improves an environmentally friendly effect for maintaining a coastal ecosystem by protecting the trees planted in the planting portion from the sea breeze containing large amount of salts and cuts off the strong sunlight in the summer because a thick forest can be created by the multiple boundary blocks.;COPYRIGHT KIPO 2014
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