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The barrier is a large wall prison found in Donkey Kong Country 3: Dixie Kong's Double Trouble! that Baron K. Roolenstein used to trap the Banana Bird Queen. The exterior appears to have some strange hieroglyphic codes on it.
When Baron K. Roolenstein, under the guise of KAOS, invaded the Northern Kremisphere, he managed to make sure the Banana Bird Queen would not mess with his plans by casting a spell contained in a crystal key to imprison her. After the Banana Bird Queen's imprisonment, he sent out the Kremling Krew to capture all the Banana Birds they could, as the Banana Birds were the only ones who could free their mother. Almost all the Banana Birds were sealed away in the Banana Bird Caves, and the Banana Birds who were not captured took refuge with several members of the Brothers Bear family.
If Dixie and Kiddy Kong manage to obtain all the Banana Birds, the birds will take the Kongs to their queen and mother. The birds will sing a song that will counteract the barrier's power, breaking the barrier and freeing the Banana Bird Queen.