Water drum

… The mouth harp is sometimes called a Maultrommel (mouth drum) in German, and is sometimes played as a percussion instrument without a melody. The water drum is said to have originated from hitting the water surface with a cup-shaped hand held down, and is a popular name often used for percussion instruments that use water. Examples include the water gourd in Africa, which is played by placing a bowl-shaped gourd upside down in a container of water and hitting it with a thin stick, the Guinean version in which a shallowly hollowed-out rectangular board with handles attached to both ends is placed face-down on the water surface and hit, and the Papua New Guinean version in which a cylindrical piece of tree trunk is cut into a shape with a handle attached and the opening is struck on the water. …

*Some terminology that mentions "water drum" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　口琴をドイツ語でマウルトロンメルMaultrommel(口太鼓)と称する場合があり，実際に旋律をもたずに打楽器的に奏されることがある。　ウォーター･ドラムwater drumは椀形に丸めた手を伏せて水面を打つことから始まったといわれ，水を利用した打楽器にしばしば用いられる俗称。水を入れた容器の中に椀形のヒョウタンを伏せ，細い棒でたたく，アフリカのウォーター･ゴードwater gourd，ギニアでは浅くくり抜いた長方形の板の両端に柄を付け，水面に伏せて打ちつけるもの，パプア･ニューギニアでは木の幹を切って円筒形にしたものに柄を付け，開口部を水に打ちつけるものなどがある。…

※「water drum」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報