The janamsakhi accounts of Guru Nanak Dev Ji's eastern travels place him at a series of sites that are now gurdwaras across northern India and beyond: Nanakmata in Udham Singh Nagar, Reetha Sahib in Champawat, Guru ka Tal at Agra, sites in Bengal, Assam, Odisha and as far as Dhaka.
Nanakmata was a Nath jogi centre where the tradition places an exchange between the Guru and the Siddhas. Reetha Sahib is named for a soapnut tree whose fruit the account says turned sweet.
Beyond India the trail runs to Sri Lanka, to Baghdad, where an inscription said to record his visit exists and is disputed, and to Mecca and Medina.
The historicity of the individual sites varies from likely to unsupported. Most were identified as gurdwara sites in the eighteenth and nineteenth centuries or later.
What the trail does show, whatever its accuracy in detail, is that within a few generations Sikhs across a very large area believed the founder had been there, and built accordingly.
Nanakmata in Udham Singh Nagar district was a Nath establishment where the tradition places a confrontation, and it became a gurdwara afterward.
Reetha Sahib in the Kumaon hills is where soapnuts are said to have turned sweet, and the tree there is part of the account.
The eastern travels are the least documented of the udasis. The sites exist in a line running through Uttarakhand and toward Nepal and Bengal, and no through route connects them for a traveller.