The Gemara lists ten things created at twilight before the first Shabbat, including 'the mouth of the sea' (pi habor / pi hayam) — a foundational Chazal teaching that the Maharal uses to argue miracles were woven into the fabric of creation as pre-natural conditions, not violations of the created order.
וְאוּר בְּמוֹצָאֵי שַׁבָּת אִיבְּרִי? וְהָא תַּנְיָא: עֲשָׂרָה דְּבָרִים נִבְרְאוּ בְּעֶרֶב שַׁבָּת בֵּין הַשְּׁמָשׁוֹת, אֵלּוּ הֵן: בְּאֵר, וְהַמָּן, וְקֶשֶׁת, כְּתָב, וּמַכְתֵּב, וְהַלּוּחוֹת, וְקִבְרוֹ שֶׁל מֹשֶׁה, וּמְעָרָה שֶׁעָמַד בּוֹ מֹשֶׁה וְאֵלִיָּהוּ, פְּתִיחַת פִּי הָאָתוֹן, וּפְתִיחַת פִּי הָאָרֶץ לִבְלוֹעַ אֶת הָרְשָׁעִים. תָּנוּ רַבָּנַן: עֲשָׂרָה דְּבָרִים נִבְרְאוּ בְּעֶרֶב שַׁבָּת בֵּין הַשְּׁמָשׁוֹת, וְאֵלּוּ הֵן: בְּאֵר, וּמָן, וְקֶשֶׁת, הַכְּתָב, וְהַמַּכְתֵּב, וְהַלּוּחוֹת, קִבְרוֹ שֶׁל מֹשֶׁה, וּמְעָרָה שֶׁעָמַד בָּהּ מֹשֶׁה וְאֵלִיָּהוּ, פְּתִיחַת פִּי הָאָתוֹן, וּפְתִיחַת פִּי הָאָרֶץ לִבְלוֹעַ אֶת הָרְשָׁעִים. וְיֵשׁ אוֹמְרִים: אַף מַקְלוֹ שֶׁל אַהֲרֹן שְׁקֵדֶיהָ וּפְרָחֶיהָ, וְיֵשׁ אוֹמְרִים: אַף הַמַּזִּיקִין, וְיֵשׁ אוֹמְרִים: אַף
The Gemara stated that fire was originally created at the conclusion of Shabbat. The Gemara asks: Was fire created at the conclusion of Shabbat? Wasn’t it taught in a baraita: Ten miraculous phenomena were created in heaven on Shabbat eve during twilight, and were revealed in the world only later? They were: Miriam’s well, and the manna that fell in the desert, and the rainbow, writing [ketav], and the writing instrument [mikhtav], and the tablets of the Ten Commandments, and the grave of Moses, and the cave in which Moses and Elijah stood, the opening of the mouth of Balaam’s donkey, and the opening of the earth’s mouth to swallow the wicked in the incident involving Korah. The Sages taught: Ten phenomena were created on Shabbat eve during twilight, and they were: Miriam’s well, and manna, and the rainbow, writing, and the writing instrument, and the tablets, the grave of Moses, and the cave in which Moses and Elijah stood, the opening of the mouth of Balaam’s donkey, and the opening of the mouth of the earth to swallow the wicked in the time of Korah. And some say that even Aaron’s staff was created then with its almonds and its blossoms. Some say that even the demons were created at this time. And some say that even