I think it came from around Dalmatia-Montenegro with Impresso-Cardial, moved up the Danube-Tisza valleys, was strong in Northern Lengyel, got cut off by Yamnaya and mixed initially, in a similar setting as Mokrin, then being integrated into Epi-Corded networks, related to the Nitra culture (R1a-dominated), probably it was in Late Otomani-F�zesabony, they came up when the Tumulus Culture pressed them Eastwards, into the triangle of Hungary-Slovakia-Romania. From there both Channelled Ware-G�va and in it E-V13 as the dominant lineage emerged.
Basically there is almost no way around the Tisza basin for the main initial spread. If we look at this map, the Upper Tisza basin was the source, the first spread along the Tisza basin, the secondary along the Danube basin, and you just got it:
https://www.researchgate.net/publica...-data-from.png
Note that these "Danube basin countries" are still the very core of the E-V13 distribution to this day! The main exception is Greece!
Just compare it with the latest frequency map of mine:
https://i.ibb.co/Gvb0bPk/E-V13-estimates.jpg
https://imgbb.com/4Z575NM
If we, in the next step, make an overlap of the geography with the Channelled Ware/Eastern Urnfield and later Hallstatt spread, its again nearly everything, except the Greek territories, which are a special case of secondary spread down the Morava valley first and then sea borne.
its also noteworthy that E-V13 wasn't even the first E1b1b group which took this path, Lengyel-Michelsberger did it before, along the Danube as well. They were however largely replaced by TRB-GAC and the steppe people later.
Compare with the initial Channelled Ware/G�va expansion:
https://www.researchgate.net/profile...ntioned-in.png
https://www.researchgate.net/profile...ntioned-in.png
Within the context of Urnfield:
https://media.springernature.com/ori..._Fig2_HTML.gif
https://media.springernature.com/original/springer-static/image/chp%3A10.1007%2F978-1-4419-6633-9_10/MediaObjects/978-1-4419-6633-9_10_Fig2_HTML.gif
The main problem is of course that they initially cremated - compare the maps before with the early spread of cremation:
https://www.oeaw.ac.at/fileadmin/Ins...CBAB_Karte.jpg
The main core was the Tisza basin, along the Danube basin the main spread of Urnfield and Channelled Ware customs took place, in successive waves. The latest was Hallstatt itself, which stems indirectly and directly, in part at least, from Channelled Ware-Basarabi.