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The Green Lagoon has a rich history dating back to the 1850’s when it was originally dug by hand by the Arlesey Brick and Lime Company. The pit was used to transport chalk down the hill on a small tramway to the brick works on Hitchin road. However, around the turn of the century, the pit was abandoned and allowed to flood, leading to the creation of the Blue Lagoon as the new work site. The Green Lagoon itself is triangular in shape and covers about 3 acres of land. The northern end features a sheer chalk cliff that drops to a maximum depth of 30 feet, making it the deepest side of the lagoon. The eastern side is the shallowest, at around 12 feet under the rod tip, while the western side ranges between 14 and 16 feet. The middle of the lagoon is the deepest point at 35 feet. The entire area is surrounded by trees, providing shelter even in stormy conditions. The water retains its temperature well, allowing fish to feed throughout the winter and become more active as spring approaches. One of the most breathtaking sights at the Green Lagoon is 'Magic corner', where various species gather in early spring to spawn without a care for nearby fishermen. The lagoon is home to a variety of fish, including Mirror, Common, and Leather Carp, with most in the upper teens but plenty of twenties are also caught. The largest catch this season has been a Leather Carp weighing 25 lbs. Other species found in the lagoon include Pike up to 30 lbs, Tench up to 7 lbs, Bream up to 8 lbs, skimmers, Rudd and Roach, big Perch, and the occasional Crusian Carp. The Green Lagoon has been a popular spot for local fishermen, serving as a starting point for many enthusiasts. There is no specific hotspot in the lagoon as each swim has produced results, with many fish caught close to the rod tip using a variety of baits.