A painting of water lilies by French impressionist Claude Monet is expected to fetch up to 40 million pounds when it is auctioned off in London.

The painting, will star among dozens of modern masterpieces this month in what is being billed as the most valuable art auction ever held in the city.

Painted in 1906, the work is part of the French Impressionist’s iconic Nympheas series and was included in his historic exhibition in Paris three years later.

Christie’s said it expected the London sale of 63 modern and impressionist artworks, on June 23, to realise between 163.67 and 231.18 million pounds.

Offered from a private collection, the Monet alone is expected to fetch between 30 and 40 million pounds, it said in a statement.

The London sale follows a similar auction at Christie’s New York on May 4, where Pablo Picasso’s “Nude, Green Leaves and Bust” set a new record as the most expensive work of art ever sold, fetching 106.4 million dollars.

Another star work is the Blue Period masterpiece by Picasso, “Portrait of Angel Fernandez de Soto”, a painting of his friend and fellow artist also known as “The Absinthe Drinker,” expected to fetch 30 to 40 million pounds.

One of the last great portraits painted by the turn-of-the-century Austrian symbolist Gustav Klimt, his “Portrait of Ria Munk III” is also expected to go for between 14 million and 18 million pounds, Christie’s said.

Other high-profile lots include “Parc de l’hopital Saint-Paul,” painted in 1889 by Vincent van Gogh during his voluntary confinement at an asylum in Provence, as well as works by Henri Matisse, Rene Magritte and Otto Dix.