Exceptional waterfront home on the south shore of Big Rideau Lake, in the Township of Rideau Lakes - the most coveted waterfront address in Eastern Ontario. Located on the UNESCO World Heritage Rideau Canal system. 60 mins from Ottawa/Kingston; 15 mins from the amenities in Perth/Smiths Falls. Big Rideau Lake is the largest in the Rideau system - 32km long & 6km wide, with fishing, recreational activities, premier boating & direct access to 202km of waterway between Ottawa & Kingston. Nestled in serene Bests Bay, this executive custom-built brick home offers ~3,000 sq ft of well-designed living space on a 1.66-acre lot with 150 ft of private waterfront. Ideal for family living & entertaining. 4 large bedrooms on the upper floor, master with ensuite bathroom, large walk-in closet, lake-facing patio; 2nd bathroom with shower & jacuzzi. On the main level, the large main entrance hall opens to a large dine-in kitchen. Dining room is directly off the kitchen area as is separate office. Large windows afford magnificent views of sunsets across the lake; a fireplace makes for cozy winter evenings. Mudroom located off the side entry; spacious attached 2-car garage, powder room located in the mud room. Sunny 3-season porch overlooks the lake. Floors mostly hardwood on main level. Lower level fully finished - large sliding doors walk out to the lake; full bathroom with shower & 4-person working sauna, 2 double-door built-in storage cupboards in hall with floor-ceiling shelving. Furnace room adds significant extra storage. Stunning spiral staircase connects the 3 levels of the home. Geothermal heat pump provides highly affordable heating & cooling; a Generac generator supplies uninterrupted power to entire dwelling in the event of interruption to primary supply. True waterfront luxury with private dock & boathouse. A rare opportunity to own a premier waterfront property in one of Eastern Ontario's most sought-after lakefront communities.