Question: Where is the United Kingdom's largest indoor water park located?

Context articles: Key Lime Cove
Boyne Mountain Resort
World Waterpark
Mt. Olympus Water &amp; Theme Park
Ray's Splash Planet
Indoor water park
Daying County
Wet N Wild (North Shields)
Yerevan Water World
Sandcastle Water Park (Blackpool)

KeyLime Cove was a resort and indoor waterpark located in Gurnee, Illinois near Six Flags Great America.
 KeyLime Cove was listed as the "Official Resort of Six Flags Great America".
 The resort was located about an hour away from Chicago and less than an hour from Milwaukee.
 The resort closed on April 19, 2017 and will be under renovations for the next year to transform the tropical themed resort to a north woods themed look.
 Great Wolf Resorts, a Madison-based company with over 14 resorts opened and 4 under construction/renovation, acquired the property on February 6 at the Gurnee Village board meeting the night before.
 The indoor water park will also be expanded by about 20,000 square feet.
 In addition, further facilities are set to include an outdoor water park, more shopping and other amenities.
 The company’s Head of Development, Bryson Heezen, reportedly told Gurnee village board that fresh family rooms with themes such as a “wolf den,” new restaurants, mini-bowling and ropes courses were also on the cards.
 Guests that booked a future stay after April 20, 2017 will receive a notification that your stay was cancelled and a refund for any deposit held is being processed.
 Due to the large number of refunds being processed, it may take up to 30 days for guests to receive a full refund.
 Guests holding a KeyLime Cove gift card and are eligible to receive reimbursement for any remaining balance on the gift card.
 Refunds of gift card balances are currently being processed and will be mailed to guests within 30 days.
Boyne Mountain Resort is a ski resort with a collection of accommodations in Northern Michigan located near Boyne City operated by Boyne Resorts.
 The center piece is an upscale resort called The Mountain Grand Lodge and Spa.
 Boyne Mountain has continued use of the first chairlift built, originally constructed in Idaho in 1936 for use at a resort in Sun Valley, Idaho.
 It is also the location of Avalanche Bay, the largest indoor water park in Michigan.
 Boyne Mountain is the sister resort of Boyne Highlands.
World Waterpark is a water park located at West Edmonton Mall in Edmonton, Alberta, Canada.
 Opened to the public in 1986, it is the world's second-largest indoor water park after the Tropical Islands Resort in Germany.
 It has a maximum capacity of 5000 guests, an average air temperature of 31 °C , and contains the world's largest indoor wave pool with a capacity of 12.3 million litres.
Mt. Olympus Water and Theme Park is a theme park and water park complex in Wisconsin Dells, Wisconsin.
 Mt. Olympus consists of four areas of the park: Zeus' Playground (outdoor theme park), Neptune's Water Kingdom (outdoor waterpark), The Parthenon (indoor theme park), and Medusa's indoor water park.
 In 2010 and 2011, the park purchased several smaller nearby independent motels and hotels and renamed them, painting them blue and white to fit the Greek theme for the main hotel.
 Many other area hotels and motels offer free or reduced-priced tickets.
Ray's Splash Planet (often referred to as Ray's) is a Mecklenburg County, North Carolina funded water park located in Charlotte, North Carolina, United States.
 The aquatic facility is operated by the Mecklenburg County Park and Recreation department.
 Ray's Splash Planet is considered one of the largest indoor water parks in both of the Carolinas and is the largest water park in Charlotte, North Carolina, with over 29,000 square feet of space and using over 117,000 gallons of water at 87 degrees.
 The water is cleaned and sanitized through the use of chlorine, filtration and an ultraviolet germicidal irradiation system.
 There are multiple attractions including the Blue Comet, a three story figure 8 slide, and other family friendly attractions like the Orbiter, Saturation Station, the Vortex, Meteor Showers, Moon Beach and the Sea of Tranquility.
 The water park also features a fitness center and gymnasium shared with the Irwin Academic Center, an educational center of the Charlotte-Mecklenburg Schools system.
 The first floor of the facility includes the pool area, locker rooms, birthday party classrooms and concessions stand.
 The second story includes the fitness center with an aerobics/dance studio.
 Access to the indoor gymnasium is also located on the second floor.
 Ray's Splash Planet is located on North Sycamore Street near Johnson & Wales University and is just off Interstate 77 in North Carolina in the Third Ward section of Uptown Charlotte.
 The water park opened on October 15, 2002 with help from Mecklenburg County Park and Recreation's partnership with Charlotte-Mecklenburg Schools.
 Major competitors are Carowinds in Charlotte, North Carolina, Great Wolf Lodge in Concord, North Carolina and Wet 'n Wild Emerald Pointe in Greensboro, North Carolina.
An indoor water park is a type of water park that is located inside a building.
 An indoor water park has the ability to stay open year-round, as it is not affected by weather conditions.
Daying County () is a county of Sichuan province, China, under the administration of Suining City and in the central part of the Sichuan Basin.
 In 2002, it had a population of 520,000 residing in an area of 703 km2 .
 Daying is remarkable for being the home of the "Chinese Dead Sea", a tourist attraction that is based on a salt lake with 9 times the salinity of the ocean and which constitutes the largest indoor water park in China.
 The G42 Shanghai–Chengdu Expressway and Dazhou–Chengdu Railway (达成铁路) traverses east–west through the entire length of the county.
Wet N Wild is an indoor water park situated in North Shields, Tyne and Wear, England.
 It was the United Kingdom's largest indoor water park when opened in 1993, a title subsequently claimed by Sandcastle Waterpark.
 The park is situated in the Royal Quays complex, and features numerous slides, a wave machine, and rapids.
 It was confirmed Wet N Wild would reopen following a takeover by Moirai Capital Investments;
Yerevan Water World (Armenian: Ջրաշխարհ ("Jrashkharh")) is a water park situated on Myasnikyan Avenue of Nor Nork district in the Armenian capital of Yerevan.
 The Water World has an open-air water park occupying an area of 2.5 hectares and an indoor water park of 0.5 hectare.
Sandcastle Waterpark is an indoor waterpark in an 84-degree tropical climate located at South Beach in Blackpool, Lancashire, England.
 It opened in 1986 on the site of the former South Shore Open Air Baths as a joint public/private partnership.
 Sandcastle Waterpark has more than 18 slides and attractions.