Memadion, Water park in Tel Aviv, Israel

Memadion is a 40-dunam water park on the Yarkon River in northern Tel Aviv, next to Luna Park. Its slides include the Side Winder, an 11-metre U-shaped tube slide opened in 2006, the four-lane Meteor run on mats, and three enclosed tube slides replacing the old Mirage slalom. Pools include a wave pool, two adult pools and a toddlers' pool, plus the fenced shallow "Children's World" area with small colourful slides, water-spraying pipes, red mushroom showers and a giant tipping bucket.

In 1986 the municipal company Ganei Yehoshua tendered a build-operate-transfer water park on the Yarkon riverbank; Hadar Tiberia, owned by Yair Werman, won and with partners invested 18 million shekels. Construction began in 1989 and Memadion opened in summer 1990 on 40 dunams. The operating franchise later passed to Kibbutz Shefayim and then to Ir HaShaashuim, which also runs Luna Park Tel Aviv.

The slides carry names visitors use in conversation: Meteor, Slalom, Side Winder, and the old Mirage run, replaced in 2016 by three enclosed tube slides. The children's area, "Olam HaYeled", opened in summer 2002 with low colourful slides, water-spraying pipes, red mushroom showers and a giant tipping bucket in a fenced shallow pool.

Memadion spreads over 40 dunams beside Luna Park Tel Aviv in Yarkon Park, so allow time to walk between the wave pool, the adult pools and the children's area. Since summer 2023 visitors receive water bottles at the entrance, after a class action over the lack of drinking fountains. The park also has football, basketball and beach volleyball courts and an entertainment stage.

In February 2023, after a class action claimed the park had no drinking fountains and restaurant staff would not give cold water free, a settlement was reached: from summer 2023 bottles are handed to visitors at the entrance, a benefit the park valued at 400,000 shekels a year.