Last updated at 18:25 21 March 2008

Life can have its little irritations when you're cruising around the world on your £100million superyacht.

For example, the endless vista of clear blue sea fails to provide much greenery to ease the eye - apart from the odd tropical island.

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As good as it gets: The 'gigayacht', complete with tree-filled garden and swimming pool

For the owner of a forthcoming craft named WallyIsland, however, this will not be a problem.

For he, or she, will have a personal ocean-going garden.

The 325ft-long yacht is to feature a growing area with shrubbery and flower beds, kept healthy by an irrigation system.

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An artists's impression of the onboard garden - a revolutionary concept in luxury yachts

It will also have a tennis court, pool and five accommodation decks including a main saloon, dining room, library, cinema, spa and fitness area.

The fuel tanks are so large that they allow for five years of cruising without having to stop for a fill-up.

Its designer, Monaco-based Wally Yachts, is known for coming up with unconventional ideas and is already in negotiations with a potential buyer.

The term megayacht has already been used for private vessels more than 220ft long. However, WallyIsland - which is 59ft across and at half load weighs 2,730 tons, is considered to be in a class of its own and so earns the name "gigayacht".

Wally's Monica Paolazzi said the vessel, an artist's impression of which is above, would fulfil the dream of someone who wanted to "live comfortably on board like on their own estate".

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The yacht can carry enough fuel to cruise for FIVE years

She added: "This is a yacht where you have a piece of land that you can use to play your favourite sport, to grow your favourite plants, to enjoy your favourite outdoor activity.

"This will appeal to someone who wants to be completely independent. No other yachts offer this kind of garden."

The buyer will be able to specify the exact foliage required before building is completed.

Because of its huge 1,000 square metre deck space, which is finished in teak, the WallyIsland design differs from that of traditional super-yachts in that it is constructed more like a tanker.

Although the makers are refusing to disclose a price for the extraordinary vessel, it is believed that this industrial method of construction will bring the cost down to a "competitive" figure of around £100million.

WallyIsland includes sleeping quarters for up to 40 crew and 24 guests as well as the owner's suites.

It holds 750,000 litres of fuel, enabling it to stay out of port for 15,000 nautical miles.

The aft deck holds two 45ft motor yachts, as well as space for two 27ft sailing yachts, two cars and water-toys including six jetskis.