10. Gibbs Quadski: This is the Gibbs Quadski, an amphibian that operates as both an ATV and a personal watercraft. Quadski is a 4-stroke car, and top speed of 72 km/h (45 mph) on both land and water.

9. Amphicar: The Amphicar is a German amphibious automobile which first produced for sale to the public in 1961. The vehicle was designed by Hanns Trippel and manufactured by the Quandt Group at Lübeck and at Berlin-Borsigwalde. Its performance was modest, and only 4000 were produced by 1965.

8. Gibbs Aquada: The Gibbs Aquada is a high speed amphibious car developed by Gibbs Sports Amphibians in New Zealand. It is capable of speeds over 160 km/h (100 mph) on land and 50 km/h (30 mph / 26 knots) on water.

7. Rinspeed Splash: Well-known Swiss sportscar tuning firm Rinspeed built an amphibious car in 2004. With complicated hydrofoil design, the vehicle can go with speed 31 mph (50 km/h) on water. And on land top speed is 200km/h. It has a natural gas powered engine with displacement capacity of 750cc.

6. SeaRoader Lamborghini Countach: Lamborghini Countach that was modded by SeaRoader aquatecht Mike Ryan. It costs nearly $3,007.

5. Gibbs Humdinga: The 5-seater ‘Humdinga’ concept vehicle is a full-time 4WD powered by a 350 BHP V8 engine, capable of 160 kmh on land and on water at 65 kmh. Designed by Gibbs Technologies.

4. Hydra Spyder: The Hydra Spyder is an ultra-modern, stylish, retro-looking part sports car, part speedboat manufactured by Cool Amphibious Manufacturers International. it can reach speeds of at least 125 mph (201 km/h), while in the water it can attain 53 mph (85 km/h). The standard production model weights approximately 3,300 lbs and is powered by a Corvette LS2 6.0 liter V-8 engine rated at 400 h.p., 6000 rpm, and 400 ft. lbs of torque at 4000rpm.

3. Dobbertin HydroCar: It’s main body is made of type 304 stainless steel, so rust will not be a problem. Under the hood, it has a fully dyno-tuned Chevrolet engine that produces 762 horsepower at 5,800 rpm. Originally, the car used a six-bladed propeller.

2. Sea Lion: Sea Lion prototype is world’s fastest amphibious “land speed” vehicle. It was designed to set world records on land and on water. On the road, the Sea Lion clocks in at 125 mph (201 km/h). In the water, meanwhile, it can reach respectable speeds of as much as 60 mph (96 km/h). The body of the Sea Lion was made by using TIG-welded 5052 aluminum and CNC-milled.

1. WaterCar Panther: WaterCar’s latest offering is the Panther. WaterCar calls the Panther the “ultimate vehicle” It is capable of reaching water speeds of up to 45mph – almost as fast as an average speedboat – plus can be driven up to 80mph on land. The Panther’s design is based on a Jeep CJ8 Scrambler, however, because the chassis of the Jeep was too heavy for the water, the Panther’s lightweight chassis is made of chromoly steel.

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SOURCE: http://www.wonderslist.com/top-10-incredible-amphibious-cars/