You are in the Underdark and need to see as far as you can to scout for your party: What is the maximum distance that you can see, using darkvision, without magic or magical items?
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First, pick a race with Superior Darkvision, such as the drow (PHB, p. 24) or deep gnome (MToF, p. 114). That sees you at 120 ft. already.
Superior Darkvision. Your darkvision has a radius of 120 feet.
Then, pick a class archetype that grants you darkvision in such a way that it extends your range, such as the Gloom Stalker ranger archetype (XGtE, p. 42).
Umbral Sight. At 3rd level, you gain darkvision out to a range of 60 feet. If you already have darkvision from your race, its range increases by 30 feet.