Reference for Bekhorot 9:2

מַעְשַׂר בְּהֵמָה מִצְטָרֵף כִּמְלֹא רֶגֶל בְּהֵמָה רוֹעָה. וְכַמָּה הִיא רֶגֶל בְּהֵמָה רוֹעָה, שִׁשָּׁה עָשָׂר מִיל. הָיָה בֵּין אֵלּוּ לְאֵלּוּ שְׁלשִׁים וּשְׁנַיִם מִיל, אֵינָן מִצְטָרְפִין. הָיָה לוֹ בָאֶמְצָע, מֵבִיא וּמְעַשְּׂרָן בָּאֶמְצָע. רַבִּי מֵאִיר אוֹמֵר, הַיַּרְדֵּן מַפְסִיק לְמַעְשַׂר בְּהֵמָה:

Tithed animals join together as long as they are within grazing distance [of one another]. And what is grazing distance? Sixteen [Roman] miles. If there was between these [animals] and these [animals] thirty-two mils, they do not combine. If [however] he had one [animal] in the middle he brings them into the middle and tithes them. Rabbi Meir says: the [river] Jordan is divides for matters of tithing animals.

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